iOS (Jailbroken): Auxo is a jailbreak tweak that changes how the app switcher on iOS works. Auxo uses small previews instead of just an app icon, redesigns the music playback page, adds toggles, and more.

You load up Auxo just like you would the normal app switcher in iOS with a double tab of the home button. The main difference you'll notice right away with Auxo is that it actually gives you a preview of the app currently running instead of just showing you the icon. From there, you can swipe down on an icon to kill that app, or swipe right to get to the redesigned playback controls for the music app. You'll also find quick toggles to enable functions like Bluetooth, 3G, and lock rotation. It seems simple, but Auxo works incredibly well and looks great doing it. It supports iOS 5.1 and up, and you can find it by searching for "Auxo" in Cydia.